Revision - Unit 5 Gases, liquids and solids

Pressure is measured in ... (choose all that apply)

• Pa

• N/kg

• N/m²

• N

Calculate the pressure of the shoe on the ground.

• 17'500 Pa

• 28 Pa

Chris' mass is 75 kg. Gravity is 10 m/s2. The area of the bottom of his shoes is 200 cm2. What is the pressure his body is applying to the ground?

• 150'000 Pa

• 375 Pa

• 37'500 Pa

Why do liquids and gases apply pressure in all directions?

• Because liquid and gas particles move in all directions.

• Because force divided by area results in 360° pressure.

Which diagram shows increasing pressure with depth?

• A

• B

What is a fluid?

• Any substance that can flow.

• A substance that can bend and change shape.

What is the SI unit for temperature?

• ° Celsius

• Kelvin

What is the SI unit for mass?

• gram

• kilogram

A 2 kg ball dropped from height hits the ground with 300 J of KE.

Calculate the height it was dropped from (assume g = 10 m/s²).

• 20 m

• 30 m

• 15 m

• 5 m

Max lifts a 50 kg box 1 meter in 3 seconds. Calculate his power output. (g = 10 m/s²)

• 16.6 W

• 166.6 W

• 150 W

• 1500 W